header_type measurement_meta_t {
    fields {
    promotion: 1; // indicating variable for resubmit;
    stage: 4; // indicating variable for stage of back inserting;
    M1_collision: 4; 
    M2_collision: 4;
    M3_collision: 4;
    M4_collision: 4;
    flag1: 32;
    flag2: 32;
    flag3: 32;
    flag4: 32;
    flag5: 32;
    flag6: 32;
    M1_cnt: 32;
    M2_cnt: 32;
    M3_cnt: 32;
    M4_cnt: 32;
    min: 32;
    rand_num: 32;
    prom_num: 27;
    srcip_pred: 4;
    dstip_pred: 4;
    proto_pred: 4;
    }
}

metadata measurement_meta_t m_meta;
